Update '.drone.yml'

.drone.yml

@@ -11,12 +11,12 @@ steps:
   - name: deploy
     image: alpine
     environment:
-    FTP_HOST:
-      from_secret: FTP_HOST
-    FTP_USERNAME:
-      from_secret: FTP_USERNAME
-    FTP_PASSWORD:
-      from_secret: FTP_PASSWORD
+      FTP_HOST:
+        from_secret: FTP_HOST
+      FTP_USERNAME:
+        from_secret: FTP_USERNAME
+      FTP_PASSWORD:
+        from_secret: FTP_PASSWORD
     commands:
       - which lftp || ( apk --update add lftp )
       - lftp -e "mirror -R ./dist/ samuel-philipp.de/; bye" -u $FTP_USERNAME,$FTP_PASSWORD $FTP_HOST